January 26, 2014 7:19 am Buildings evacuated after gas main break in Cambridge, Mass. Cambridge police tweeted they were closing down roads in Kendall Square US & World Videos 24:50 @Issue: Final push to convince undecided voters 24:47 @Issue: Early voting starts in Massachusetts 24:49 @Issue: 30 days left until the presidential election 24:04 @Issue: Breaking down the Massachusetts ballot questions 24:49 @Issue: What's next after presidential debate?